Why some diamonds look so dark compared to other similarly cut stones?

[Aino]

Perhaps a silly question but sometimes I see stones like this one:

https://www.jamesallen.com/loose-di...-h-color-vs1-clarity-excellent-cut-sku-535302

They appear extremely dark and "foggy" and stones with similar HCA scores and overall C's/details look a lot better/normal. The fluorescence can be none like in this one. Do these stones have some mineral issues or what's the reason behind these stones? Or is it just the cut?

Would love to understand better.

Thanks

 

[Matthews1127]

Perhaps a silly question but sometimes I see stones like this one:

https://www.jamesallen.com/loose-di...-h-color-vs1-clarity-excellent-cut-sku-535302

They appear extremely dark and "foggy" and stones with similar HCA scores and overall C's/details look a lot better/normal. The fluorescence can be none like in this one. Do these stones have some mineral issues or what's the reason behind these stones? Or is it just the cut?

Would love to understand better.

Thanks

I’m following, as I am quite curious to know if there’s more to this than cut/depth issues.

 

[rockysalamander]

In that particular case, its just a bad video. You can see that the entire video has a odd blue/grey cast. You can get a sense of the weird lighting when the stone turns. Can you see the rose hue on the table? I pasted a random well-light example. Can you see how the grey on the top stone has tha same odd hue compared to the more pure grey of the second?

 

[rockysalamander]

Another example. I filtered for D+ failt flour or non and PS parameters with GIA or AGS. Some still just still light and filmed poorly.



Red star here: not perfect, but not bad enough to explain why the whole stone looks grey. To me, its the lighting.
https://www.jamesallen.com/loose-di...-f-color-vvs2-clarity-excellent-cut-sku-28558

 

[WinkHPD]

Just speaking in general, not about this specific diamond.

GIA has an incredibly wide range of what it calls excellent. When you have a diamond that is too steep and deep, then light that would be more beneficial if it came to your eye is going to the top of your finger, where you have no optical sensors.

Steep deeps maintain more weight and smaller diameters for that weight than a diamond cut for beauty, but the cutters who cut them, and the vendors who sell them know that most people will never know this information. People who study, learn these things and find better cut and more beautiful diamonds.

Wink

 

[Aino]

Another example. I filtered for D+ failt flour or non and PS parameters with GIA or AGS. Some still just still light and filmed poorly.



Red star here: not perfect, but not bad enough to explain why the whole stone looks grey. To me, its the lighting.
https://www.jamesallen.com/loose-di...-f-color-vvs2-clarity-excellent-cut-sku-28558

Thank you for your answer It makes sense. These were bugging me during my hunt for my own first rock and sometimes the proportions were good and the stone looked just crap. That explains it!

I would think that diamond vendors would have stricter quality controls for these videos as it must be hard to sell a diamond with such a video.